$\mathop {\lim }\limits_{x \to 0} \left( {\frac{{{a^x} - {b^x}}}{x}} \right) = $

  • A
    $\log \left( {\frac{b}{a}} \right)$
  • B
    $\log \left( {\frac{a}{b}} \right)$
  • C
    $\frac{a}{b}$
  • D
    $\log {a^b}$

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